Windows on Arm support

[prayaas-a]

There's already an open issue about this (#23709) but I thought it was worth a discussion to see how project maintainers feel this should be accomplished.

For a project like MuseScore Studio which supports plugins, Arm64EC might be the better choice to maintain compatibility with existing x64 plugins. I looked a little bit into what that would entail and, at this point, the biggest blocker would probably be the fact that Qt supports native Arm64 but not Arm64EC yet. However, it looks like there's been some recent progress in the Qt project and Arm64EC support is in the works.

I'm not sure how far along existing efforts to port to Windows/Arm64 are, but if Qt provides an easy Arm64EC target, would the devs consider targeting Arm64EC? This would resolve the problem of any x64 DLL that's loaded at runtime while allowing the core app to compile with native Arm64 code and benefit from performance improvements while the ecosystem can incrementally adapt to native (or hybrid) code. Statically linked libraries will still need to be updated/recompiled.

Thoughts?